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| 51. | Double canceller |
| 二次对消器 |
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| 52. | double immunodiffusion |
| 双向免疫扩散 |
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| 53. | double imposition |
| 复税 |
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| 54. | double repeated |
| 双围盘轧制的 |
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| 55. | ride double |
| (二人)共骑一马 |
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| 56. | double feature |
| 两片连映 |
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| 57. | bent double. |
| 对折 |
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| 58. | double speed |
| 双速 |
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| 59. | double colonization |
| 两度定居 |
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| 60. | double strike |
| 双线 |
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